Radon gas is a known cause of lung cancer, with an estimated 12% of lung cancerdeaths attributable to radon gas, or 15,000 to 22,000 lung cancer-related deaths annually in the U.S. In comparison, everyone over the age of 50 should get a colonoscopy to prevent colorectal cancer which kills over 50,000/year.
Test for radon in each of the lowest structural areas of the home.
Home Depot sells test kits for less than $25.
About 100 times cheaper than a colonoscopy and can save a bunch of people.